/* ============================================
   SERVYN - UI/UX ENHANCEMENTS
   Final Expert Deep Dive Improvements
   ============================================ */

/* ============================================
   LOADING STATES & SKELETONS
   ============================================ */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-title {
    height: 2rem;
    width: 60%;
    margin-bottom: 1rem;
}

.skeleton-card {
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    background: white;
    box-shadow: var(--shadow-sm);
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    border-top-color: #667eea;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   ENHANCED FORM VALIDATION
   ============================================ */
.form-control:invalid:not(:focus):not(:placeholder-shown) {
    border-color: var(--danger);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23ef4444'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath d='m5.8 3.6 .4.4.4-.4M6 8.4V6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
    padding-right: calc(1.5em + 0.75rem);
}

.form-control:valid:not(:focus):not(:placeholder-shown) {
    border-color: var(--success);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2310b981' d='m2.3 6.73.98-.98-.98-.98-.98.98.98.98zm1.48-1.48L4.75 4.27l-1.97-1.97-1.97 1.97 1.97 1.97zm1.48-1.48l.98-.98-.98-.98-.98.98.98.98z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
    padding-right: calc(1.5em + 0.75rem);
}

.form-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
}

.form-control:invalid ~ .form-feedback {
    display: block;
    color: var(--danger);
}

.form-control:valid ~ .form-feedback {
    display: block;
    color: var(--success);
}

/* ============================================
   ENHANCED EMPTY STATES
   ============================================ */
.empty-state-enhanced {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--radius-xl);
    border: 2px dashed var(--gray-300);
    position: relative;
    overflow: hidden;
}

.empty-state-enhanced::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.05) 1px, transparent 1px);
    background-size: 30px 30px;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 30px); }
}

.empty-state-enhanced .icon {
    font-size: 4.5rem;
    color: var(--gray-400);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    animation: pulse-icon 2s ease-in-out infinite;
}

@keyframes pulse-icon {
    0%, 100% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.1); opacity: 1; }
}

.empty-state-enhanced h4 {
    color: var(--gray-700);
    margin-bottom: 0.75rem;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.empty-state-enhanced p {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.empty-state-enhanced .btn {
    position: relative;
    z-index: 1;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    max-width: 400px;
}

.toast-custom {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: slideInRight 0.3s ease-out;
    border-left: 4px solid;
}

.toast-custom.success {
    border-left-color: var(--success);
}

.toast-custom.error {
    border-left-color: var(--danger);
}

.toast-custom.info {
    border-left-color: var(--info);
}

.toast-custom.warning {
    border-left-color: var(--warning);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-custom.success .toast-icon {
    color: var(--success);
}

.toast-custom.error .toast-icon {
    color: var(--danger);
}

.toast-custom.info .toast-icon {
    color: var(--info);
}

.toast-custom.warning .toast-icon {
    color: var(--warning);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--gray-900);
}

.toast-message {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ============================================
   ENHANCED BUTTON STATES
   ============================================ */
.btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading .btn-text {
    opacity: 0;
}

.btn-loading .loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* ============================================
   ENHANCED CARDS
   ============================================ */
.card-enhanced {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.card-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card-enhanced:hover::before {
    transform: scaleX(1);
}

.card-enhanced:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--gray-300);
}

/* ============================================
   SMOOTH PAGE TRANSITIONS
   ============================================ */
.page-transition {
    animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   ENHANCED TABLES
   ============================================ */
.table-enhanced {
    border-collapse: separate;
    border-spacing: 0;
}

.table-enhanced thead th {
    background: var(--gray-50);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem;
    border-bottom: 2px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 10;
}

.table-enhanced tbody tr {
    transition: all 0.2s ease;
}

.table-enhanced tbody tr:hover {
    background: var(--gray-50);
    transform: scale(1.01);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.table-enhanced tbody td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-100);
}

/* ============================================
   ENHANCED BADGES
   ============================================ */
.badge-enhanced {
    padding: 0.5rem 0.875rem;
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.025em;
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    text-transform: uppercase;
}

.badge-enhanced i {
    font-size: 0.875rem;
}

/* ============================================
   FOCUS STATES (ACCESSIBILITY)
   ============================================ */
*:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.btn:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.form-control:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* ============================================
   ENHANCED MODALS
   ============================================ */
.modal-enhanced .modal-content {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.modal-enhanced .modal-header {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 1.5rem;
}

.modal-enhanced .modal-header .btn-close {
    filter: brightness(0) invert(1);
}

.modal-enhanced .modal-body {
    padding: 2rem;
}

.modal-enhanced .modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: 1.5rem;
    background: var(--gray-50);
}

/* ============================================
   ENHANCED STAT CARDS
   ============================================ */
.stat-card-enhanced {
    position: relative;
    overflow: hidden;
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
}

.stat-card-enhanced::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.stat-card-enhanced:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--gray-300);
}

.stat-number-enhanced {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin: 0.5rem 0;
}

/* ============================================
   ENHANCED NAVIGATION
   ============================================ */
.nav-link-enhanced {
    position: relative;
    transition: all 0.3s ease;
}

.nav-link-enhanced::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link-enhanced:hover::after,
.nav-link-enhanced.active::after {
    width: 80%;
}

/* ============================================
   ENHANCED MOBILE UX
   ============================================ */
@media (max-width: 768px) {
    .toast-container {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
    
    .stat-card-enhanced {
        margin-bottom: 1rem;
    }
    
    .stat-number-enhanced {
        font-size: 2rem;
    }
    
    /* Larger touch targets */
    .btn, .nav-link, .card {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Better spacing on mobile */
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    /* Stack cards on mobile */
    .row.g-4 > * {
        margin-bottom: 1rem;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .navbar, .footer-modern, .btn, .no-print {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }
}

/* ============================================
   REDUCED MOTION (ACCESSIBILITY)
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}